CN2103218U

CN2103218U - Rare-earth permanent-magnet synchronous motor with whole rotor light-charge structure

Info

Publication number: CN2103218U
Application number: CN 91206040
Authority: CN
Inventors: 米春亭
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 1991-04-18
Filing date: 1991-04-18
Publication date: 1992-04-29

Abstract

The utility model relates to a rare-earth permanent magnet synchronous motor with an integral rotor lamination structure, which belongs to the technical field of electrotechnics. The utility model is characterized in that a rotor punching tool has an integral structure, the upper end of a magnetic steel groove which is arranged in the radical direction is not communicated with a rotor cage groove, and the lower end is provided with a circular magnetic isolating groove which is concentric to a rotating shaft so as to efficiently reduce the magnetic leakage but not reduce the mechanical strength of a rotor. The utility model has the advantages of rare-earth material saving, shock and vibration resistance and low cost.

Description

Rare-earth permanent-magnet synchronous motor with whole rotor light-charge structure

The utility model relates to a kind of rare-earth permanent-magnet synchronous motor with integral rotor punching structure, belongs to electrical technology field.Rare-earth permanent-magnet synchronous motor has efficient height, power factor height, advantage such as energy-conservation, is applied within the specific limits.Though but, have deficiencies such as leakage field is big, bad mechanical strength owing to having rare-earth permanent-magnet synchronous motor now or not possessing integral rotor punching structure or possess integral rotor punching structure.

Once disclosed a kind of " rare-earth permanent-magnet synchronous motor " as CN2064129U, the magnetic line of force of its epitrochanterian rare-earth permanent magnet is through the closed leakage flux that forms of the magnetic bridge between magnet and the rotating shaft.Because leakage flux is bigger, rotor must use more rare earth magnet.Be the restriction leakage flux, magnetic bridge must be done smallerly, thereby has reduced the mechanical strength of rotor.Rotor can not bear bigger impact, vibration etc., is of limited application.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, provide a kind of possess can effectively reduce leakage flux, and don't influence the rare-earth permanent-magnet synchronous motor of the integral rotor punching structure of rotor mechanical intensity.The rare-earth permanent-magnet synchronous motor that is provided is made up of stator, rotor etc.Its stator and common rare-earth permanent-magnet synchronous motor are similar, and rotor is made of axle (1), iron core (2), rare earth magnet (3) and conduction mouse cage (4).The rare earth magnet radial arrangement, cutting orientation magnetizing.This rotor can be four, six, ends of the earth structural shape.The rotor punching that constitutes iron core (2) has overall structure, be not communicated with between the upper end of the magnet steel groove of radial arrangement and the cage grooves on the rotor punching, the lower end have with the air gap magnet isolation tank (5) of the concentric garden annular of rotating shaft, the magnet isolation tank of every magnetic pole lower end be unidirectional, and be not communicated with between the magnet isolation tank that an adjacent magnetic pole is symmetrically distributed with it.Therefore, be between magnetic pole, to intersect to exist at air gap magnet isolation tank on the axonometric drawing, symmetrical distribution, be in N simultaneously extremely down, or be in S simultaneously extremely down.

This technology can reach the purpose of effective reduction leakage field.Be maximum magnitude restriction leakage field, as far as possible little between the two neighboring pole magnet isolation tank apart from a, a=0.5～2mm gets smaller value to the motor that torque is little.The thickness b of magnet isolation tank should be enough big, b=5～10 δ (δ-motor gas-gap width), and the distance c between magnet isolation tank and the rotating shaft also should be enough big, general c=3～5mm, the size of conduction mouse cage designs by the requirement of general design of electrical motor.

Compared with prior art, the utlity model has following advantage:

1, rotor punching has overall structure, and technology is simple, is convenient to processing.

2, the rare earth magnet consumption is few, and motor cost is low, is convenient to promote.

3, rotor mechanical intensity height can withstand shocks, vibrate, and is applicable to various occasions, is included in the rugged environment and uses.

Below in conjunction with accompanying drawing principle of the present utility model is further elaborated:

Fig. 1, be the axial cutaway view of rotor.

Fig. 2,3,4 is four, six respectively, the punching structure chart of ends of the earth rotor.

Fig. 5, (a) are the main flux and the stray flux distribution figure of prior art.

Fig. 5, (b) are main flux of the present utility model and stray flux distribution figure.

Among the figure: 1-rotating shaft, 2-iron core, 3-rare earth magnet, non-magnet_conductible material, 6-main flux, 7-leakage flux, 8-magnetic bridges such as 4-conduction mouse cage, 5-air or epoxy.

In physics, the magnetic line of force is got back to the principle that the S utmost point forms the closed-loop path from the N utmost point, and leakage magnetic flux also should form the closed-loop path. If with the only way which must be passed people of leakage magnetic flux for narrowing down, thereby just can limit the size of leakage magnetic flux. And according to above-mentioned principle, only size a just can be limited in leakage magnetic flux in certain scope in enough hour fully. Among Fig. 5 (a), leakage magnetic flux (7) can be passed through magnetic bridge (8) closure, and for guaranteeing the rotor mechanical strength, magnetic bridge is generally done greatlyyer, reaches 3～5mm. And among Fig. 5 (b), leakage magnetic flux only can form the closed-loop path by size a place, because the globality of rotor, size a can be enough little, reaches 0.5～2mm. As seen the two compare, and the latter reduces more than 60%～80% than the former leakage magnetic flux.

Secondly, among Fig. 5 (a), when being subjected to shock and vibration, the rotor magnetic bridge very easily deforms, and among Fig. 5 (b), rotor has globality, and shock and vibration all can not deform.

Thereby the motor that the utility model provides can reduce leakage field effectively, has again higher mechanical strength.

Below in conjunction with application, enforcement of the present utility model is set forth.The weaving of FOXT52-6 type is embodiment of the present utility model with three-phase rare-earth permanent-magnet synchronous motor, this power of motor 0.6kW, voltage 380V, efficient 91%, power factor 0.98,1000 rev/mins of rotating speeds.Use rotor punching structure shown in Figure 3.Size a, b, c are respectively 0.5mm, 3mm and 4mm.Compared with prior art, behind employing the utility model, motor rare earth consumption reduces 20%, and cost reduces by 5%, and leakage flux reduces 80%, and shock-resistant, oscillation intensity increases by 500 above, and all other indexs all are not less than prior art.

Claims

1, a kind of rare-earth permanent-magnet synchronous motor, by stator, compositions such as rotor, rotor is by axle (1), iron core (2), rare earth magnet (3) and conduction mouse cage (4) constitute, it is characterized in that the rotor punching that constitutes iron core (2) has overall structure, the upper end of rare earth magnet groove is not communicated with cage grooves, there is the annular magnet isolation tank concentric with rotating shaft the lower end, is not communicated with between the magnet isolation tank between two neighboring pole, and its spacing is from being 0.5～2mm, thick 5～10 δ of magnet isolation tank (δ-motor gas-gap width), distance is 3～5mm between magnet isolation tank and the rotating shaft, and magnet isolation tank intersects existence between magnetic pole, symmetrical distribution.

2, rare-earth permanent-magnet synchronous motor as claimed in claim 1 is characterized in that rotor rare earth magnet radial distribution, cutting orientation magnetizing.

3, rare-earth permanent-magnet synchronous motor as claimed in claim 1 is characterized in that its rotor can be four, six, ends of the earth structural shape.